Thursday, April 12, 2007

Eliminating black spots in extruded film/sheet with careful processing and good quality polymer

Processors occasionally find black spots in extruded products such as films and sheets. Thin film creates very conspicuous black spots that are obviously not only unacceptable, but can create holes in the product when the film is subsequently oriented. The two basic sources for black spots either originate in the polymer raw material or gets introduced during processing. The polymer can also contain formulation defects that char instead of melting, becoming a dark speck surrounded by a gel.

For more details please click on the following link
http://www.plastemart.com/upload/literature/Eliminatingblackspots.asp

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